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    STUDIA PHYSICA - Issue no. 2 / 2003  
         
  Article:   DOSE DISTRIBUTION IN THE IRRADIATION OF MEDULLOBLASTOMA WITH TWO ADJACENT FIELDS.

Authors:  C. CUDALBU, A. STAN, O. COZAR, D. RISTOIU.
 
       
         
  Abstract:  In this paper we analyse the absorbed dose distribution for the irradiation with two adjacent fields in the case of medulloblastoma treatment having in view the secondary effects of the irradiation at the sensitive organs level such as the cord and lung. The proposed objectives are: to achieve dose uniformity in the field junction region; to avoid the underdosage or overdosage in the junction area; the hot spot created due to the overlap of the beams at the depth has to be clinically acceptable; the dosage received by a sensitive structure such as the spinal cord must not exceed its tolerance dose.The analysis by geometric and dosimetric points of view shows that at the cord and lung level exists the risk of an important overdosage. This inconvenient can be solved by using three adjacent fields for irradiation.  
         
     
         
         
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